SPOKANE, Wash. — Investigators pursued what they said were promising leads Wednesday in a bombing attempt at a Martin Luther King Jr. Day parade in which someone left a backpack filled with sophisticated explosives on a bench.

An official familiar with the case said the bomb had a remote detonator and the ability to cause mass casualties. It was defused without incident Monday but unnerved residents of Spokane.

What do you do in a rental market where seemingly every new apartment building is offering a boatload of amenities and high-end finishes? If you're Charleston, S.C.-based apartment developer Greystar you double down and build an extra luxury project.